Siemens CONTACT BLOCK FOR REAR MOUNTING - 3SB54

Upgrade your industrial control panels with the reliable Siemens 3SB5 Contact Block, designed for use with 22mm pushbuttons, selector switches, and key actuators. This modular and compact contact block features a double break, parallel bridge contact system for high switching reliability, even at low voltages and currents—a perfect match for PLC and DCS circuits.

With snap-on assembly, captive screws, and SIGUT® safety terminal design, wiring is quick and secure while protecting against accidental contact. Rated for long mechanical and electrical life, the 3SB5 series meets demanding application requirements in machine tools, marine controls, and general automation.

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Key Features

• Contact Block Options: 1NO, 1NC, 2NO, 2NC, or 1NO+1NC

• Operating Voltage: up to 660V AC (Ui), 690V AC (insulation voltage)

• Current Rating: 6A @ 24V DC, 10A @ 110V DC, 8A @ 220V DC, 10A @ 240V AC

• Modular 22mm design fits Siemens 3SB5 actuators (pushbutton, selector, key)

• Compact mounting depth: as low as 20mm for single contact blocks

• Screw terminal (SIGUT) for fast, secure connections

• Snap-mounting for rapid assembly, reduces wiring time by ~30%

• High reliability at low signal levels (17V DC, 5mA)

• Integrated low-voltage glow protection, built-in surge suppressor (for LED lamps)

• Degree of Protection: IP65 for most actuators

• Mechanical life: 10 million cycles; electrical: up to 3 million cycles

• Color-coded housing for easy identification

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Applications

• Industrial machinery and automation panels

• Marine and machine tool controls

• PLC and DCS input circuits

• Operator stations and safety systems

• Control desks in power plants, transport, and building automation